CN211206515U - High-air-tightness concrete gas content tester - Google Patents

Abstract

The utility model relates to a concrete air content apparatus of high gas tightness, it includes upper cover and staving, the top of staving is provided with the connecting block that is used for coordinating the upper cover and is used for the locking Assembly of fixed upper cover and connecting block, locking Assembly's quantity is more than or equal to three, locking Assembly is including the last briquetting that is used for the butt upper cover, a connecting piece that is used for the lower briquetting of butt connecting block and is used for connecting briquetting and lower briquetting, go up the briquetting and lower briquetting respectively with connecting piece sliding connection, the setting of connecting piece is used for driving the first driving piece that the briquetting removed, a second driving piece that is used for driving the briquetting removal down and the installation cavity that is used for holding first driving piece and second driving piece. The user can press from both sides tightly upper cover and connecting block, makes the connection between upper cover and the connecting block more stable firm, reduces the clearance that upper cover and connecting block probably produced in the experimentation. The utility model discloses the effect that the gas tightness is good has.

Description

High-air-tightness concrete gas content tester

Technical Field

The utility model belongs to the technical field of the technique of concrete gas content apparatus and specifically relates to a concrete gas content apparatus of high gas tightness is related to.

Background

The frost resistance of concrete is an important index reflecting the durability of concrete, and in order to improve the frost resistance, the introduction of micro bubbles in the concrete is reduced, so that the water seepage of the concrete is reduced. The concrete gas content measuring instrument is an instrument for measuring the gas content of concrete mixture, and is widely applied to the quality control of concrete in the concrete application field of various industries at home and abroad at present.

As shown in fig. 1, chinese utility model like the authorized bulletin number CN209125990U discloses a concrete gas content tester among the prior art, is provided with upper cover 2 and staving 1 among this utility model, is provided with the connecting block 3 that is used for cooperating upper cover 2 on the staving 1, and the edge of upper cover 2 rotates and is connected with fixture block 4, and fixture block 4 passes through rotation post 41 joint on upper cover 2 surface. When the user needs fixed connection piece 3 and upper cover 2, need to inlay upper cover 2 and connecting block 3 in the inboard of fixture block 4, then screw up plum blossom knob 42 on fixture block 4 and butt in the constant head tank of upper cover 2, make upper cover 2 and connecting block 3 relatively fixed.

The patent facilitates the user to fix the upper cover 2 of the concrete gas content measuring instrument, but has certain defects. Because the fixture block 4 and the upper cover 2 can only rotate in the horizontal direction and cannot move in the vertical direction, the quincuncial knob 42, the upper cover 2, the rotating column 41 and the fixture block 4 can be regarded as a whole in the vertical direction.

When the plum blossom knob 42 is twisted to the user, the lower extreme butt of plum blossom knob 42 can restrict the rotation between fixture block 4 and upper cover 2 in upper cover 2, nevertheless does not influence the tight degree of clamp between upper cover 2 and the connecting block 3, and the fixed realization to upper cover 2 and connecting block 3 that only passes through the fixture block 4 inboard between upper cover 2 and the connecting block 3.

Generally, in the process of the experiment, the concrete mixture needs to be vibrated, which may cause a gap between the upper cover 2 and the connecting block 3, thereby affecting the air tightness of the concrete gas content tester.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a concrete air content apparatus of high gas tightness, it has the characteristics that the gas tightness is good.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a concrete gas content apparatus of high gas tightness, includes upper cover and staving, the top of staving is provided with and is used for the cooperation the connecting block of upper cover with be used for fixing the upper cover reaches the locking Assembly of connecting block, locking Assembly's quantity is more than or equal to three, locking Assembly is including being used for the butt last briquetting of upper cover, be used for the butt the lower briquetting of connecting block with be used for connecting go up the briquetting with the connecting piece of briquetting down, go up the briquetting with down the briquetting respectively with connecting piece sliding connection, the setting of connecting piece is used for driving go up the first driving piece that the briquetting removed, be used for driving down the second driving piece that the briquetting removed with be used for holding first driving piece with the installation cavity of second driving piece.

Through adopting above-mentioned technical scheme, the user is when fixed upper cover and connecting block, and briquetting and distance between the briquetting down are gone up in the adjustment of accessible first driving piece and second driving piece, and the person of facilitating the use presss from both sides tightly upper cover and connecting block, makes the connection between upper cover and the connecting block more stable firm, reduces the clearance that upper cover and connecting block probably produced in the experimentation, and then improves the gas tightness of concrete gas content apparatus.

Preferably, the first driving member includes a first lead screw, a first fixing plate for fixing the first lead screw, and a first connecting shaft for driving the first lead screw to rotate, the first fixing plate is fixedly connected to the mounting cavity, the first lead screw is rotatably connected to the first fixing plate, the connecting member is provided with a first connecting hole for exposing the first connecting shaft, the first lead screw is connected to a first driving block by a thread, the first driving block is fixedly connected to the upper pressing block, the second driving member includes a second lead screw, a second fixing plate for fixing the second lead screw, and a second connecting shaft for driving the second lead screw to rotate, the second fixing plate is fixedly connected to the mounting cavity, the second lead screw is rotatably connected to the second fixing plate, and the second lead screw is fixedly connected to the second connecting shaft, the connecting piece is provided with a second connecting hole for exposing the second connecting shaft, a second driving block is in threaded connection with the second screw rod, and the second driving block is fixedly connected with the lower pressing block.

Through adopting above-mentioned technical scheme, when the rotatory first connecting axle of user, first connecting axle drives first lead screw and rotates, and when the rotatory state of supreme briquetting and installation cavity outside butt of first drive block, first drive block ascended or descended along first lead screw. Similarly, the user can drive the second driving block and the lower pressing block to ascend or descend through the second connecting shaft. In this way, a user can directly clamp or loosen the upper pressing block and the lower pressing block through the first connecting shaft or the second connecting shaft.

Preferably, the first lead screw and the second lead screw are parallel to each other, a plurality of guide posts parallel to the first lead screw are arranged in the installation cavity, the number of the guide posts is greater than or equal to two, limiting holes used for accommodating the guide posts are respectively formed in the first driving block and the second driving block, and the limiting holes are connected with the guide posts in a sliding mode.

By adopting the technical scheme, when the first screw rod rotates, the first driving block cannot rotate under the action of the guide post and can only ascend or descend along the guide post; similarly, when the second screw rod rotates, the second driving block ascends or descends along the guide post. The guide post plays a guide role in the first driving block or the second driving block through limiting, so that the first driving block or the second driving block can move more stably.

Preferably, the upper surface of the upper cover is provided with a plurality of groups of rotating pieces corresponding to the connecting pieces, the rotating pieces are rotatably connected with supporting blocks, and the supporting blocks are fixedly connected with the connecting pieces.

Through adopting above-mentioned technical scheme, the connecting piece rotates with the upper cover to be connected, and when the user need press from both sides tight upper cover and connecting block, the supporting shoe can play the supporting role to the connecting piece, makes upper cover and connecting block be located the briquetting and down between the briquetting, does not need the user application of force, and the person of facilitating the use operates first connecting axle or second connecting axle.

Preferably, the middle part of the upper surface of the upper pressing block and the middle part of the lower surface of the lower pressing block are respectively provided with a fixing ring, and the first driving block and the second driving block are respectively and fixedly connected with a connecting plate which is used for being rotatably connected with the fixing ring.

Through adopting above-mentioned technical scheme, go up the solid fixed ring of briquetting or briquetting accessible down and relative rotation with the connecting plate to the angle that makes go up the briquetting or briquetting down can incline presss from both sides tightly upper cover and connecting block, avoids leading to area of contact to reduce because between the upper surface of upper cover and the last briquetting or the lower surface of connecting block and the lower briquetting not parallel and level, thereby stability and fastness when having improved upper cover and connecting block clamping state.

Preferably, a first weighting block is arranged at one end of the upper pressing block close to the first driving block, and a second weighting block is arranged at one end of the lower pressing block far away from the second driving block.

By adopting the technical scheme, when the upper pressing block is far away from the upper cover, the lower surface of the upper pressing block inclines downwards in the direction from the first weight block to the first weight block under the action of gravity; in a similar way, the direction tilt up of second weight piece to second weight piece is kept away from to the upper surface of lower briquetting, form a trapezoidal installation clearance between the lower surface that makes up the briquetting and the upper surface of lower briquetting, when user swivelling joint spare, the outward flange difference butt of upper cover and connecting block in last briquetting and lower briquetting, along with user's propulsion connecting piece, the lower surface of going up the briquetting is on a parallel with the upper surface of upper cover gradually, the upper surface of lower briquetting is on a parallel with the lower surface of connecting block gradually, the person of facilitating the use operates last briquetting or lower briquetting, the efficiency that the user presss from both sides tight upper cover and connecting block has been improved.

Preferably, the lower surface of the upper pressing block and the upper surface of the lower pressing block are respectively provided with an elastic buffer pad.

By adopting the technical scheme, on one hand, the cushion pad can increase the contact area and the friction force between the upper pressing block and the upper cover or between the lower pressing block and the connecting block, so that the upper cover and the connecting block are clamped more stably; on the other hand can play the effect of buffering isolation to the contact between last briquetting and the upper cover or between lower briquetting and the connecting block, prevent that upper cover or connecting block from directly contacting with last briquetting or lower briquetting, take place wearing and tearing in long-term use, influence life.

Preferably, the upper cover has a fixing groove formed on an upper surface thereof for accommodating a lower portion of the upper press block.

Through adopting above-mentioned technical scheme, the area of contact between briquetting lower part and the upper cover can be increased in the fixed slot, makes the briquetting better to the extrusion effect of upper cover, and the cell wall of fixed slot plays limiting displacement to last briquetting, prevents that connecting piece and upper cover from taking place relative rotation.

Preferably, the first connecting shaft and the second connecting shaft are respectively and fixedly connected with a force bearing block for applying force by a user.

Through adopting above-mentioned technical scheme, user's accessible atress piece is more conveniently to first connecting axle or second connecting axle application of force.

To sum up, the utility model discloses a beneficial technological effect does:

1. the utility model makes the connection between the upper cover and the connecting block more stable and firm, reduces the gap possibly generated by the upper cover and the connecting block in the experimental process, and further improves the air tightness of the concrete air content tester;

2. the utility model is provided with the first weight block and the second weight block, which is convenient for the user to operate the upper pressing block or the lower pressing block, thereby improving the efficiency of the user for clamping the upper cover and the connecting block;

3. the utility model discloses a set up the blotter, prevent that upper cover or connecting block from direct and last briquetting or briquetting contact down, take place wearing and tearing in long-term use, influence life.

Drawings

Fig. 1 is a schematic structural diagram of a concrete gas content tester in the background art.

Fig. 2 is a schematic structural view of a concrete gas content measuring instrument with high air tightness.

Fig. 3 is an exploded view of the rotating column.

Fig. 4 is a schematic longitudinal cross-section of a connector.

Fig. 5 is an exploded schematic view of the open state of the connector.

In the figure, 1, a barrel body; 2. an upper cover; 21. a threaded hole; 211. a rotating member; 22. fixing grooves; 3. connecting blocks; 4. a clamping block; 41. rotating the column; 42. a quincuncial knob; 5. a locking assembly; 51. a connecting member; 511. a support block; 5111. rotating the hole; 512. a mounting cavity; 52. pressing the blocks; 521. a first driving block; 5211. a first drive aperture; 522. a first weight; 53. pressing the block; 531. a second driving block; 5311. a second drive aperture; 532. a second weight; 54. a first lead screw; 541. a first connecting shaft; 5411. a first connection hole; 542. a first fixing plate; 5421. a first mounting hole; 55. a second lead screw; 551. a second connecting shaft; 5511. a second connection hole; 552. a second fixing plate; 5521. a second mounting hole; 56. a force receiving portion; 57. a guide post; 571. a limiting hole; 58. a connecting plate; 581. a connecting cylinder; 582. a fixing ring; 59. an elastic cushion pad; 6. a first driving member; 7. a second driving member.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Refer to fig. 2, do the utility model discloses a concrete air content tester of high gas tightness, including staving 1, connecting block 3 and upper cover 2.

The barrel body 1 and the upper cover 2 are circular in transverse cross section, and the connecting block 3 is circular. The outer diameter of the barrel body 1 is consistent with the inner diameter of the connecting block 3, so that the inner side of the connecting block 3 is bolted with the outer side of the upper part of the barrel body 1. The outer diameter of the connecting block 3 is consistent with the diameter of the upper cover 2, and the lower surface of the upper cover 2 abuts against the upper surface of the connecting block 3. The central points of the upper cover 2, the connecting block 3 and the barrel body 1 are positioned on the same vertical straight line, so that the upper cover 2 covers the inside of the barrel body 1.

Four sets of locking assemblies 5 are arranged on the periphery of the upper cover 2, and the locking assemblies 5 are distributed along the outline of the outer edge of the upper cover 2. Each set of locking assemblies 5 comprises a connecting member 51, an upper pressing block 52 and a lower pressing block 53.

The lower surface of the upper pressing block 52 abuts against the upper surface of the upper cover 2, and the upper surface of the lower pressing block 53 abuts against the lower surface of the connecting block 3, so that the upper cover 2 and the connecting block 3 are relatively fixed. The user can adjust the degree of clamping between the upper cover 2 and the connection block 3 by lifting the upper pressing block 52 or the lower pressing block 53 to change the distance between the lower surface of the upper pressing block 52 and the upper surface of the lower pressing block 53.

Referring to fig. 2 and 3, four screw holes 21 are opened in the upper surface of the upper cover 2, and the positions of the screw holes 21 correspond to the positions of the connectors 51. A supporting block 511 is arranged between each group of threaded holes 21 and the connecting piece 51, one end of the supporting block 511 close to the connecting piece 51 is welded with the surface of the connecting piece 51, one end of the supporting block 511 close to the threaded holes 21 is provided with a rotating hole 5111, the rotating hole 5111 penetrates through the supporting block 511, and a rotating piece 211 penetrates through the inside of each rotating hole 5111. The rotating member 211 is a hexagon bolt, and the rotating member 211 is a hexagon bolt.

Each of the rotation members 211 is screw-coupled to a corresponding screw hole 21, so that the lower surface of the support block 511 is engaged with the upper surface of the upper cover 2, and each of the connection members 51 and each of the support blocks 511 is rotatably coupled to the upper cover 2.

Referring to fig. 3 and 4, a mounting cavity 512 is opened at one side of the connecting member 51 close to the upper cover 2.

The interior of the mounting cavity 512 is used for driving the first driving member 6 for driving the upper pressing block 52 to move and the second driving member 7 for driving the lower pressing block 53 to move.

The first driving member 6 includes a first connecting shaft 541, a first lead screw 54, and a first fixing plate 542; the second driving member 7 includes a second fixing plate 552, a second lead screw 55 and a second connecting shaft 551.

The first connecting shaft 541, the first screw 54, the first fixing plate 542, the second fixing plate 552, the second screw 55 and the second connecting shaft 551 are sequentially arranged along the mounting cavity 512 from top to bottom.

The first lead screw 54 and the second lead screw 55 are located on the same straight line, and the first lead screw 54 and the second lead screw 55 are centrosymmetric with respect to the center point of the mounting cavity 512.

The first fixing plate 542 and the second fixing plate 552 are located in the middle of the mounting cavity 512, and the first fixing plate 542 and the second fixing plate 552 are symmetric about the center point of the mounting cavity 512. The two lengths of the first fixing plate 542 are the same as the length of the mounting cavity 512, so that the two ends of the first fixing plate 542 and the two ends of the second fixing plate 552 are bolted to the inner wall of the mounting cavity 512.

The upper surface of the connecting member 51 is provided with a first connecting hole 5411, and the first connecting shaft 541 is matched with the first connecting hole 5411.

The lower surface of the connector 51 is provided with a second connecting hole 5511, and the second connecting shaft 551 is matched with the second connecting hole 5511.

The first fixing plate 542 has a first mounting hole 5421 formed in an upper surface thereof, and the first mounting hole 5421 is matched with the first lead screw 54.

The lower surface of the second fixing plate 552 is provided with a second mounting hole 5521, and the second mounting hole 5521 is matched with the second screw 55.

The upper surface of the first lead screw 54 is attached to the top of the mounting cavity 512, the lower end of the first connection shaft 541 penetrates through the first connection hole 5411 and is bolted to the upper end of the first lead screw 54, and the lower end of the first lead screw 54 is accommodated in the first mounting hole 5421, so that the first lead screw 54 and the mounting cavity 512 are relatively fixed.

The upper end of the second lead screw 55 is accommodated in the second mounting hole 5521, the lower surface of the second lead screw 55 is attached to the bottom of the mounting cavity 512, and the upper end of the second connecting shaft 551 is inserted into the second connecting hole 5511 and is bolted to the lower end of the second lead screw 55, so that the second lead screw 55 and the mounting cavity 512 are relatively fixed.

The upper surface of the first connecting shaft 541 and the lower surface of the second connecting shaft 551 are bolted with a force-receiving portion 56, and the transverse section of the force-receiving portion 56 is in a plum blossom shape.

Four guide posts 57 are also provided inside each mounting cavity 512. Each guide post 57 is parallel to the first lead screw 54 and is located at four corners of the mounting cavity 512. The two ends of the guide post 57 are bolted with the inner wall of the mounting cavity 512 respectively.

The first lead screw 54 is provided with a first driving block 521. The upper surface of the first driving block 521 is provided with a first driving hole 5211 and four limiting holes 571. The first driving hole 5211 and the position-limiting hole 571 both penetrate through the first driving block 521, the first driving hole 5211 is located in the middle of the first driving block 521, and the position-limiting hole 571 is located at the four corners of the first driving block 521. The first driving hole 5211 is internally provided with a thread matching the first lead screw 54, and the first driving block 521 is in threaded connection with the first lead screw 54 through the first driving hole 5211.

The second lead screw 55 is provided with a second driving block 531. The upper surface of the second driving block 531 is provided with a second driving hole 5311 and four limiting holes 571. The second driving hole 5311 and the position-limiting hole 571 both penetrate through the second driving block 531, the second driving hole 5311 is located in the middle of the second driving block 531, and the position-limiting hole 571 is located at the four corners of the second driving block 531. The second driving hole 5311 is internally provided with a thread matched with the second screw 55, and the second driving block 531 and the second screw 55 are in threaded connection through the second driving hole 5311.

Each limiting hole 571 is matched with the guide post 57, and the first driving block 521 and the second driving block 531 are slidably connected with the corresponding guide post 57 through each limiting hole 571 respectively.

When the user rotates the first connecting shaft 541, the first connecting shaft 541 drives the first lead screw 54 to rotate, and the first driving block 521 cannot rotate because the first driving block 521 is limited by the guide post 57, so that the first driving block 521 can ascend or descend along the first lead screw 54 and the guide post 57. Similarly, when the user rotates the second connecting shaft 551, the second driving block 531 may be raised or lowered along the second lead screw 55 and the guide post 57.

Referring to fig. 4 and 5, a connecting plate 58 is bolted to one side of the first driving block 521 close to the upper pressing block 52, and a connecting cylinder 581 is adhered to one end of the connecting plate 58 far away from the first driving block 521. A fixing ring 582 is inserted into the connecting cylinder 581, and the longitudinal section of the fixing ring 582 is N-shaped. The upper portion of the fixing ring 582 is rotatably connected to the connecting cylinder 581, and the lower portion thereof is bolted to the middle portion of the upper surface of the upper pressing block 52.

Similarly, a connecting plate 58 is bolted to one side of the second driving block 531 close to the lower pressing block 53, and a connecting cylinder 581 is adhered to one end of the connecting plate 58 far away from the first driving block 521. A fixing ring 582 is inserted into the connecting cylinder 581, and the lower portion of the fixing ring 582 is bolted to the middle portion of the upper surface of the lower pressing block 53.

The upper pressing block 52 or the lower pressing block 53 can rotate relative to the connecting plate 58 through the fixing ring 582, so that the upper pressing block 52 or the lower pressing block 53 can clamp the upper cover 2 and the connecting block 3 at an inclined angle, and the upper surface of the upper cover 2 or the lower surface of the connecting block 3 is prevented from being uneven, so that the clamping of the upper pressing block 52 and the lower pressing block 53 is not firm enough.

The upper pressing block 52 is bolted with a first weight 522 at one end near the first driving block 521, and the lower pressing block 53 is bolted with a second weight 532 at one end near the second driving block 531.

When the upper pressing block 52 is away from the upper lid 2, the lower surface of the upper pressing block 52 is inclined downward in a direction away from the first weight 522 to the first weight 522 by gravity; similarly, the upper surface of the lower pressing block 53 is inclined upward in a direction away from the second weight 532 to the second weight 532, so that a trapezoidal installation gap is formed between the lower surface of the upper pressing block 52 and the upper surface of the lower pressing block 53.

When a user pushes the connecting piece 51 towards the upper cover 2 and the connecting block 3, the outer edges of the upper cover 2 and the connecting block 3 abut against the upper pressing block 52 and the lower pressing block 53 respectively, and in the moving process, the lower surface of the upper pressing block 52 is gradually parallel to the upper surface of the upper cover 2, and the upper surface of the lower pressing block 53 is gradually parallel to the lower surface of the connecting block 3.

The lower surface of the upper pressing block 52 and the upper surface of the lower pressing block 53 are respectively adhered with an elastic cushion pad 59 made of rubber, so that the function of buffering and isolating can be achieved, and the abrasion of the upper cover 2 or the connecting block 3 in the long-term use process can be reduced.

Four fixing grooves 22 are formed on the upper surface of the upper cover 2, and the fixing grooves 22 are matched with the upper pressing block 52, so that the lower part of the upper pressing block 52 can be accommodated in the fixing grooves 22. The contact area between each upper pressing block 52 and the upper cover 2 can be increased through each fixing groove 22, so that the pressing effect of the upper pressing block 52 on the upper cover 2 is better.

The implementation principle of the embodiment is as follows: the user is when fixed upper cover 2 and connecting block 3, the distance between briquetting 52 and the lower briquetting 53 is adjusted to accessible first connecting axle 541 and second connecting axle 551, and the person of facilitating the use presss from both sides tightly upper cover 2 and connecting block 3, makes the connection between upper cover 2 and the connecting block 3 more stable firm, reduces the clearance that upper cover 2 and connecting block 3 probably produced in the experimentation, and then improves the gas tightness of concrete gas content apparatus.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (9)

1. The utility model provides a concrete gas content apparatus of high gas tightness, includes upper cover (2) and staving (1), its characterized in that: the top of the barrel body (1) is provided with a connecting block (3) used for matching the upper cover (2) and a locking component (5) used for fixing the upper cover (2) and the connecting block (3), the number of the locking assemblies (5) is more than or equal to three, each locking assembly (5) comprises an upper pressing block (52) used for abutting against the upper cover (2), a lower pressing block (53) used for abutting against the connecting block (3) and a connecting piece (51) used for connecting the upper pressing block (52) and the lower pressing block (53), the upper pressing block (52) and the lower pressing block (53) are respectively connected with the connecting piece (51) in a sliding way, the connecting piece (51) is provided with a first driving piece (6) for driving the upper pressing piece (52) to move, a second driving piece (7) for driving the lower pressing piece (53) to move and an installation cavity (512) for accommodating the first driving piece (6) and the second driving piece (7).

2. The highly airtight concrete gas content tester as claimed in claim 1, wherein: the first driving piece (6) comprises a first screw rod (54), a first fixing plate (542) used for fixing the first screw rod (54) and a first connecting shaft (541) used for driving the first screw rod (54) to rotate, the first fixing plate (542) is fixedly connected with the installation cavity (512), the first screw rod (54) is rotatably connected with the first fixing plate (542), the connecting piece (51) is provided with a first connecting hole (5411) for exposing the first connecting shaft (541), the first screw rod (54) is in threaded connection with a first driving block (521), the first driving block (521) is fixedly connected with the upper pressing block (52), the second driving piece (7) comprises a second screw rod (55), a second fixing plate (552) used for fixing the second screw rod (55) and a second connecting shaft (551) used for driving the second screw rod (55) to rotate, the second fixing plate (552) is fixedly connected with the mounting cavity (512), the second screw rod (55) is rotatably connected with the second fixing plate (552), the second screw rod (55) is fixedly connected with the second connecting shaft (551), a second connecting hole (5511) for exposing the second connecting shaft (551) is formed in the connecting piece (51), a second driving block (531) is connected to the second screw rod (55) in a threaded manner, and the second driving block (531) is fixedly connected with the lower pressing block (53).

3. The highly airtight concrete gas content tester as claimed in claim 2, wherein: the first screw rod (54) and the second screw rod (55) are located on the same straight line, a plurality of guide columns (57) parallel to the first screw rod (54) are arranged in the installation cavity (512), the number of the guide columns (57) is greater than or equal to two, the first driving block (521) and the second driving block (531) are respectively provided with a limiting hole (571) used for accommodating the guide columns (57), and the limiting hole (571) is in sliding connection with the guide columns (57).

4. The highly airtight concrete gas content tester as claimed in claim 3, wherein: the upper surface of the upper cover (2) is provided with a plurality of groups of rotating pieces (211) corresponding to the connecting pieces (51), the rotating pieces (211) are rotatably connected with supporting blocks (511), and the supporting blocks (511) are fixedly connected with the connecting pieces (51).

5. The highly airtight concrete gas content tester as claimed in claim 4, wherein: the upper surface middle part of going up briquetting (52) and the lower surface middle part of briquetting (53) is provided with solid fixed ring (582) respectively, first drive block (521) with second drive block (531) respectively fixedly connected with be used for with gu fixed ring (582) rotate the connecting plate (58) of being connected.

6. The highly airtight concrete gas content tester as claimed in claim 5, wherein: one end, close to the first driving block (521), of the upper pressing block (52) is provided with a first weighting block (522), and one end, far away from the second driving block (531), of the lower pressing block (53) is provided with a second weighting block (532).

7. The highly airtight concrete gas content tester as claimed in claim 6, wherein: and elastic buffer cushions (59) are respectively arranged on the lower surface of the upper pressing block (52) and the upper surface of the lower pressing block (53).

8. The highly airtight concrete gas content tester as claimed in claim 7, wherein: the upper surface of the upper cover (2) is provided with a fixing groove (22) capable of accommodating the lower part of the upper pressing block (52).

9. The highly airtight concrete gas content tester as claimed in claim 3, wherein: the first connecting shaft (541) and the second connecting shaft (551) are respectively and fixedly connected with a force bearing block for applying force by a user.

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